Influence of Tempering Temperature on Fatigue and Mechanical Properties of High Strength Steel
The present study evaluates the mechanical and fatigue properties of HPF steel through the QT heat treatment with quenching process with respect to the variation of tempering temperature. Tensile, hardness and fatigue tests were performed at room temperature. As tempering temperature increases, the tensile strength and Vickers hardness values decrease, while the total elongation increases. The increasing rate of elongation in the tempering range 200~350°C is higher than the ones in other tempering ranges, though the tensile strength decreases similarly. In this study, it is observed that the HPF steel tempered at 250°C shows the best result in the low cycle fatigue test.